Privacy fences can add beauty and value to your landscape. They keep out unwanted pests, protect your kids and the family dog. They are also quite expensive, and maintaining them to get the most out of your investment is something that every homeowner thinks about. Adding a rot board to any new or existing fence adds life and protects it from moisture, weed eaters and lawn mowers. If you can cut a two-by-six and drive a few nails or screws, you can add years to your privacy fence's life in a few short hours.